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Every trade costs more than the price you see — here's what actually eats into your returns.
Every trade you place has a "sticker price" and a real cost — and the gap between them is where a lot of active traders quietly lose money. Three things make up that gap: Securities Transaction Tax (STT), brokerage charges, and slippage. None of them shows up as a line item you actively decide on, which is exactly why they're easy to underestimate. A trader who breaks even on price movement alone can still lose money overall once all three are factored in — especially with high trade frequency.
STT is a direct tax charged by the government on every trade executed on a recognised stock exchange — equity, F&O, or equity mutual funds. It applies regardless of whether the trade made a profit or a loss, and it's automatically deducted at the time of the transaction, visible on your contract note. Unlike income tax, there's no annual filing involved — it's collected instantly at the exchange level and passed on to the government by your broker.
Law update: Budget 2026 raised STT on F&O trading, effective 1 April 2026, aimed at curbing excessive speculation in the derivatives market — a meaningful cost increase for active F&O traders.
Futures STT rose 150%; options STT rose 50% — both effective 1 April 2026.
| Instrument | Old Rate | New Rate (from 1 Apr 2026) |
|---|---|---|
| Futures | 0.02% | 0.05% |
| Options (on premium) | 0.1% | 0.15% |
| Options (on exercise) | 0.125% | 0.15% |
| Equity delivery/intraday | Unchanged | |
For example: a trader running 10 futures contracts a day pays roughly ₹3,000 more in daily STT than before — close to ₹75,000 more per month at 25 trading days. For an options seller running a similar volume in premium terms, the 50% hike on premium-side STT adds up more gradually but still meaningfully over a month of active trading.
STT is charged on turnover (traded value for futures, premium value for options), not on your profit — it applies the same whether the trade wins or loses. In most F&O trades, the seller bears the STT; for equity delivery trades, both the buyer and seller pay it. This asymmetry matters for options sellers in particular, since they now absorb a larger share of the new premium-side hike compared to buyers.
Unlike STT, brokerage is set by your broker, not the government — and it varies widely. Most discount brokers now charge either a flat fee per executed order or zero brokerage on certain segments, while full-service brokers often charge a percentage of trade value.
Brokerage adds up fastest for high-frequency, small-ticket traders — a ₹20 flat fee on a ₹2,000 trade is 1% of the trade value, compared to 0.02% on a ₹1 lakh trade. Over a month of daily trading, this gap alone can be the difference between a strategy that's marginally profitable and one that quietly loses money.
Slippage is the difference between the price you expected when placing an order and the price you actually got filled at. It happens because prices move in the time between clicking "buy" or "sell" and the order actually executing — and it's worse in fast-moving or thinly-traded (illiquid) instruments.
Using limit orders instead of market orders gives you control over the price you're willing to accept — at the cost of the order possibly not executing at all if the price moves away. For example: a trader placing a market order to buy 5,000 shares of a thinly-traded small-cap may see the average fill price creep up with each partial execution, since the order consumes several price levels on the order book before it's fully filled — the last few hundred shares can end up costing noticeably more than the first.
STT, brokerage, and slippage are the three most talked-about costs, but a few smaller charges also chip away at returns on every trade and are worth accounting for in the full picture:
Individually, each of these is small — often a fraction of a rupee per trade — but combined with STT and brokerage, they form the full cost stack shown on a contract note.
None of these costs are large in isolation — but they compound with every single trade. A strategy that looks profitable based on price movement alone can turn unprofitable once STT, brokerage, slippage, and the smaller charges are subtracted from every entry and exit, especially for high-frequency approaches like scalping or intraday trading.
For example: a trader nets an average ₹500 gross profit per day from price movement alone. If total transaction costs across all trades that day come to ₹150, the real, bankable profit is ₹350 — 30% lower than what the raw price movement suggested. Over a month, ignoring this gap can make a strategy look far more profitable on paper than it actually is in the account.
Before judging whether a strategy "works," check your net returns after all transaction costs — not just the gross price movement you captured.
Key Takeaway: STT (raised in Budget 2026 for F&O), brokerage, slippage, and smaller charges like exchange fees and stamp duty all eat into returns on every single trade, win or lose. They matter most for high-frequency strategies — always evaluate a strategy's profitability net of these costs, not just on price movement alone.
STT is automatically deducted at the time of the transaction by your broker and deposited with the government — it's visible on your contract note, and you don't need to pay it separately.
Barely. The Budget 2026 hike is targeted at F&O. Equity delivery STT is unchanged, and a buy-and-hold investor incurs STT only twice — at purchase and eventual sale — so the cumulative impact stays minimal.
Using limit orders instead of market orders, trading during high-liquidity hours, and avoiding thinly-traded instruments all help reduce slippage — though limit orders carry the trade-off of possibly not executing if the price moves past your set level.
For traders who report trading as business income (common for frequent F&O traders filing ITR-3), STT and brokerage are typically allowable business expenses that reduce taxable profit. For those reporting under capital gains, treatment differs — check with a CA based on how you classify your trading activity.
STT goes to the central government, while exchange transaction charges go to NSE/BSE for running the trading infrastructure, and SEBI turnover fees fund market regulation — three separate bodies collecting three separate, smaller charges.
Disclaimer: This article is for general educational purposes only and does not constitute personalized financial, investment, tax, or legal advice. Figures, rates, and rules mentioned may change over time — verify current details with an official source or a qualified professional before making financial decisions.